Dell Vostro laptop does not turn on, the fan works but nothing appears on the screen

Hello, I have a Dell Vostro laptop. 

Last night it got really hot out of nowhere when it was in my bag (not while in use) and then wouldn't turn on, the fans were working, the charging light was flashing red and white and that's it, nothing on the screen. Today, while the computer was plugged in, I tried to turn it on again, I succeeded for a moment, but very quickly when I tried to use it, the screen went black (with some flickering). I tried turning it off and on again but it doesn't work, and the computer refuses to turn on again. Like yesterday the fan works and the charging light starts flashing white and red.

I would very appreciate your help, thanks